Mining-machine bit



March 18', 1924. 1,481,211

J. F. DILLON MINING MACHINE BIT Filed Sept. 16, 1920 atented JAMES F. DILLON, OI CROWN CITY, OHIO, ASSIGNOB '10 NEWTON K. BO, OF BOWDIL, OHIO.

G-MACHINE BIKE.

Application filed September 16, 1920. Serial No. 410,593.

To all whom it may concern:

Be it lmown that I, JAMES F. DILLON, citizen of the United States residing at Crown City, inthe county of (irallia and State of Ohio, have invented certain new and useful Improvements in Mining-Machine Bits, of which the following is a specification.

This invention relates to bit holders and bits and particularly to a bit holder and bi for coal minin machines.

In coal mining machines there is revided an endless chain having recessed ugs in which bits are disposed. These bits are formed with a shank and an angularly di- 1 rected cutting portion and are formed in one piece. The chain ordinarily operates in a horizontal plane and as the teeth and bits run across the face of the coal, they cut their way through it. These bits when dulled have to be entirely removed and sent to the shop to be resharpened and this requires that the operator of the machine shall carry with him quite a supply of bits in order to replace by sharpened bits, bits which become worn.

The general object of my invention is to provide a bit wherein the cutting tooth of the bit is removable and is relatively cheap, so that when the cuttin tooth has been dulled, it may be removed and replaced by a new tooth and the old tooth thrown away, if desired, without any great loss.

A further object is to provide a cutting tooth of such character that after one end of it has been dulled, the tooth may be turned about so that the opposite end may be used. 1 p

Still another object is to provide a cuttin bit of such shape that it may be easily helc l in position and which is so constructed that it does not have to be gauged when placed within a recessed lug of the sprocket chain element, and whereby teeth of various: widths may be mounted in the bit, therefore providing for all the clearance necessary.

Other objects will appear in the course of the following descriptlon.

My invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a side elevation of a chain link with one form of my improved cuttin bit applied thereto, one of the lugs of the inks being in section.

Figure 2 is a perspective view of the cutting bit with the clamping bar and tooth removed.

Figure 3 is a perspective view of the clamping bar used with the body shown in Figure 2,

Figure 4 is a perspective view of the'cutting tooth,

Figure 5 is an end view of the clamping bar shown in Figure 3,

Figures 6 and 7- are cross sections. of the cutting tooth, showing teeth of different sizes, I

Figure 8 is a side elevation of another form of cutting bit,

Figure 9 is a sectional view through the oufler portion of the bit shown-in Figure 8, an

vFigure 10 is a perspective view of the toot used with the bit shown in Figure In the drawing, I have shown two lorms of bit, and have shown the ordinary chain element in which the bit is mounted. Referring to Figures 1 to 4, the numeral 10 designates the stock or shank of the bit which is rectangular in. cross section and which on one face is recessed, as at 11, this recess beginning in spaced relation to the butt end of the shank 10 and extending parallel to the side of the shank for a certain distance and then being angularly directed as at 12. The end of the shank terminates in what may be termed a head inclined portion 12 is, as illustrated in Figpre 2, outwardly convergent, and intersectmg the apex of this angular face is a screw threaded bore 16.

iYCoacting with the body of the bit is a clamp member 17 which is formed of a strip of steel or like metal fitting within the recess 11, resting against the shoulder at the inner end of this recess, and angularly bent, as at 18, at itsend to extend parallel to the edge face 12 of the body. The inner face of this portion 18 is angularly recessed, as at 19, and bored for the passage of a screw 20 which is adapted to enter the screw threaded bore 16.

The cutting tooth of this form of bit is illustrated in Figure 4. This tooth is des ignatecl 21 and is angular in cross section so that the outer face of the tooth fits the recess 19 in the clamp 17, while the inner face of the tooth fits the angular faces of the portion 12. The tooth is formed with a central aperture 22 throu h which passes the screw 20. The extremities of the tooth are angularly ground in opposite directions so that when the tooth is in place, one angular end will fit a ainst the faces of the recess 11, as illustrate in Figure 1, and the other angular end will pro ect beyond the extremity of the head 13 and of the angular end 18 of the clamp 17, in the manner also illustrated in Figure 1.

It will be obvious that with the construction shown in Figure 1, teeth 21 of various widths may be used and that these teeth may project beyond the sides of the shank or stock 10 to any desired degree, thus providing for a maximum of clearance. It will also be obvious that the teeth 21 may be turned end for end and thus make itpossible for the teeth to be used during an entire shift for cutting coal by simply changing ends when the teeth become dull. This is not possible with the old style of bit, which requires, when the teeth become dull, that another set of bits be used. This complete set of bits weighing about twenty-five pounds, being unhandy therefore to carry and not necessarily available at the time when most needed. It will be seen that the teeth of this bit are very light, that the angular nature of the teeth makes them very strong and gives them a cutting edge which is particularly efiective. Furthermore, as before stated with regard to the construction illustrated in Figure 7 teeth of various widths may be used. The tooth being angular in cross section adds materially to the value of the device. The angular shape of the tooth makes it easily held in position, it further enables the tooth to be made wider, and more strength can be obtained where the hole is drilled to prevent the bit from breaking and, as before remarked, provides for all the clearance desired. The object of the shoulder 15 on the body of the bit is to prevent the shank of the bit being set too far down in the chain and thus do away with the necessity of gauging the bits. With the old style bits all of the bits had to be gauged carefully to one and three-quarters inch but with my improved bit there will be no necessity for this gauging, as each bit must be set exactly in the same position as any other bit because of the necessity of the screw passing through the central aperture 22 in the tooth. Another particular advantage of the bit shown in igure 1, is'that the position of the set screw 20 ofiers a minimum of obstruction which might retard the shavings and the coal dust out from the coal.

In Figure 8 I show another form of bit.

near/air In this it re, the bit has a shank 23 and head 24. he shank being recessed as at 25, to provide a shoulder 26 and the head being thicker than the shank to provide a shoulder 27. The head is recessed as at 28 to receive the tooth and one face 28 of this recess is inclined to the axis of the shank 23. The recess is open at its ends as at 30 and 31 and the outer wall 32 of the recess is parallel to the face 29. The forward face of the head is angular with regard to a longitudinal axis, as at 33, and projects beyond the opening 30. (Joacting with this body is the clamping member 3a, which is angular in form and adapted to fit within the recess 25 and abut against the shoulder 26, the upper extremity of this clamping member being beveled as at 37 and having a screw threaded aperture for the passage of a binding screw 38. The

tooth 39 is angular in cross section, as in the other form of my device, but is beveled as at 40 at one end to lie fiat against the face of the recess 25 and the opposite end is opposiitely beveled as at t1, to form the cutting e go. against the face of this tooth and holds it in position. It will be seen that only one size of tooth may be used with this bit, whereas in Figure 1, teeth of .difierent widths may be used.

While T he e illustrated two forms of bit, other forms may be used embodying the principles of my invention, the broad idea of my invention being the use of a bit made in sections which may be caused to clamp upon the tooth and hold it in its operative position, these clamping sections, however, permitting the tooth to be removed and replaced when desired. Another important feature lies in the use of the shoulder at the junction of the head with the shank of the bit, permitting the bit to be inserted in the recess of the link without the necessity of gauging. Tn Figure 1, I have illustrated in connection with my improved bit an ordinary link, designated generally A, which has a recess a to receive the shank of the link, and which is provided with the usual set screw B to enga e and hold the bit in place. Further, While have illustrated bits which are disposed practically in one plane, yet it will be understood that the upper portion of the bits might be laterally angled with relation to the lower portions of the shanks of the bits to various degrees without departing from the spirit of the invention. llt will be understood that the lugs or links A to make up the chain are cast in such position that the bits extend at difierent angles so as to cause a kerf or cut to be made of about six inches width to enable the cutter head of the machine to go under the coal throu h the channel thus made. This kerf may e secured by making the bits laterally angular, as above described, or by casting the lugs a The binding screw 38 simply bears Mill lltl

[disposed with respect to the sha of the links at various an les to the plane of movement of the chain. y making the bit in sections, as I make it, for the purpose of clamping the tooth therein, it is possible because of the fact that the shank of the bit sets down within the socket in the link, for the two sections to be engaged and held ri idly in relation to each other by the screw of the link, thus holding the bit as if within a vise.

Having thus described the invention, what is claimed as new is:

1. A bit for mining machines including a sectional stock,a tooth removably disposed between said sections, and a screw holding the sections in engagement with each other and clamping the tooth in place, said screw passing through the tooth.

2. A bit for mining machines including a sectional stock, a tooth angular in cross section disposed between said sections, the confronting .faces of the sections being angular to conform to the angular cross section of the tooth, and means for clamping said sections against each other and against the tooth, said means extending through the tooth.

3. A bit for mining machines including a sectional stock, a tooth angular in cross section disposed between said sections, the confronting faces of the sections being angular to conform to the angular cross section of the tooth, and a screw connecting the sections of the stock with each other and passing through the tooth.

4. A bit for mining machines including a stock formed to provide a shank and a head, the shank and head being recessed, a clamping member disposed in said recess, a tooth removably disposed between the clamping member and the head, and a screw passing through the clamping member, through the tooth and into the head holding the clamping member and tooth in place.

5. A bit for mining machines including a stock formed to provide a shank and a head, the head projecting beyond the shank at one point to form a shoulder, one face of the head and shank being recessed and the recessed face of the head being an lat-lg an having outwardly convergent faces, a tooth angular in cross section and having beveled extremities, the reentrant faces' of the tooth fitting against the outwardly convergent faces of the head, a clamping member disposed within said recess and angular at one end to extend parallel to the angular face of the head, the inner face of the angular end of the clamping member being reentrantly angled to fit against the angular exterior face of the tooth, and. a screw passing through the angular end of the clamping member, through said tooth and into the head holding the clamping member and tooth in osition.

6. A bit for mining machines including a sectional stock, a tooth removably disposed between said sections, and means connecting the sections clamping the tooth in place, saidmeans extending through the tooth.

7. A bit for mining machines comprising a shank angularly directed at its outer end and formed to provide a tooth supporting face, and a tooth detachably engaged a ainst said face, the inner end of the tooth eing beveled to bear against the shank.

8. A bit for mining machines comprising a shank angularly directed at its outer end and formed to provide a tooth supporting face, and a tooth detachably engaged with said face, the inner end of the tooth being beveled whereby the rear face of the tooth will bear against said first mentioned face and the inner beveled end of the tooth will bear against the shank.

9. The combination with a link of a cutting chain, said link having a recessed lug to hold a cutting bit, of a cutting bit removably disposed in the recess of the lug and formed to provide a shank having an angularly disposed head, a clamping member adapted to fit against one face of the shank and having an angular portion parallel to th adjacent face of the head, a tooth disposed between the angular portion of said member and said face of the head, means passing through the angular portion of the clamping member to engage the head holding the tooth in place, and means for clam ing the bit in place within said recess an forcing the clamping member and the shank of the bit toward each other and the clamping member against the tooth.

10. As a new article of manufacture, a cutting bit tooth for mining machines straight from end to end and angular in cross section, the opposite extremities of the tooth being beveled in opposite directions and the tooth being provided with a central opening.

In testimony whereof I aflix mg signature.

JAMES F. DILLO 1,. 8.] 

